前面介紹了 YARP 通過配置文件的方式配置代理轉發（傳送門），而眾所周知，微軟的一貫作風就是能通過配置文件做的事情，通過編碼的方式也能實現！YARP 也不例外，廢話不多說，直接上代碼！

首先，參照官方文檔，我們先新建一個 InMemoryConfigProvider 類，并且繼承 IProxyConfigProvider 接口，類里面還包含了一個 IProxyConfig 的類，別看漏了噢！

這里多嘴一下，下面的代碼出現了 volatile 關鍵字，介紹一下它：volatile 是 C# 中用于控制同步的關鍵字，其意義是針對程序中一些敏感數據，不允許多線程同時訪問，保證數據在任何訪問時刻，最多有一個線程訪問，以保證數據的完整性，volatile 是修飾變量的修飾符。

public class InMemoryConfigProvider : IProxyConfigProvider{    private volatile InMemoryConfig _config;    public InMemoryConfigProvider(IReadOnlyList<RouteConfig> routes, IReadOnlyList<ClusterConfig> clusters)    {_config = new InMemoryConfig(routes, clusters);    }    public IProxyConfig GetConfig() => _config;    public void Update(IReadOnlyList<RouteConfig> routes, IReadOnlyList<ClusterConfig> clusters)    {var oldConfig = _config;_config = new InMemoryConfig(routes, clusters);oldConfig.SignalChange();    }    private class InMemoryConfig : IProxyConfig    {private readonly CancellationTokenSource _cts = new();public InMemoryConfig(IReadOnlyList<RouteConfig> routes, IReadOnlyList<ClusterConfig> clusters){    Routes = routes;    Clusters = clusters;    ChangeToken = new CancellationChangeToken(_cts.Token);}public IReadOnlyList<RouteConfig> Routes { get; }public IReadOnlyList<ClusterConfig> Clusters { get; }public IChangeToken ChangeToken { get; }internal void SignalChange(){    _cts.Cancel();}    }}

然后添加一個擴展 InMemoryConfigProviderExtensions

public static class InMemoryConfigProviderExtensions{    public static IReverseProxyBuilder LoadFromMemory(this IReverseProxyBuilder builder, IReadOnlyList<RouteConfig> routes, IReadOnlyList<ClusterConfig> clusters)    {builder.Services.AddSingleton<IProxyConfigProvider>(new InMemoryConfigProvider(routes, clusters));return builder;    }}

接下來就是寫配置了，我個人還是喜歡在配置文件中寫，但是有動態配置需求的話，又不想登錄服務器編輯 appsetting 文件，通過編碼的方式確實更為方便，將配置寫進庫或者其它存儲方式里面，那將是隨心所欲啊！上代碼:

Program.cs

var routes = new[]{    new RouteConfig()    {RouteId = "admin",ClusterId = "admin",Match = new RouteMatch{    Hosts = new string[] {"test1.ysmc.net.cn" },    Path = "{**catch-all}"}    },    new RouteConfig()    {RouteId = "blazor",ClusterId = "blazor",Match = new RouteMatch{    Hosts = new string[] {"test2.ysmc.net.cn" },    Path = "{**catch-all}"}    }};var clusters = new[]{    new ClusterConfig()    {ClusterId = "admin",LoadBalancingPolicy = "RoundRobin",Destinations = new Dictionary<string, DestinationConfig>(StringComparer.OrdinalIgnoreCase){    { "admin", new DestinationConfig() { Address = "https://admin.blazor.zone" } }}    },    new ClusterConfig()    {ClusterId = "blazor",LoadBalancingPolicy = "RoundRobin",Destinations = new Dictionary<string, DestinationConfig>(StringComparer.OrdinalIgnoreCase){    { "blazor", new DestinationConfig() { Address = "https://www.blazor.zone" } }}    }};builder.Services.AddReverseProxy().LoadFromMemory(routes, clusters);

上面的配置代碼，跟配置文件方式的節點和屬性，都是對應的，照著寫就是了

"ReverseProxy": {  "Routes": {    "admin": {      "ClusterId": "admin",      "Match": {"Hosts": [ "test1.ysmc.net.cn" ],"Path": "{**catch-all}"      }    },    "blazor": {      "ClusterId": "blazor",      "Match": {"Hosts": [ "test2.ysmc.net.cn" ],"Path": "{**catch-all}"      }    }  },  "Clusters": {    "admin": {      "LoadBalancingPolicy": "RoundRobin",      "Destinations": {"admin": {  "Address": "https://admin.blazor.zone/"}      }    },    "blazor": {      "LoadBalancingPolicy": "RoundRobin",      "Destinations": {"blazor": {  "Address": "https://www.blazor.zone/"}      }    }  }}

最終效果還是依舊的完美，感謝大佬的觀看，謝謝！

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